nawet wyłączyć tego nie mogę,
Cytat:
To disable HTML5 player in Firefox do the following:
1) type "about:config" in the address bar
2) go to the "media.webm.enabled" setting and
3) change it to "false" by simply doubleclicking it. you probably need to restart Firefox.
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co za dziadostwo...
edit1:
YouTube Flash Player to rozwiązało problem